41 lines
1.3 KiB
C#
41 lines
1.3 KiB
C#
namespace RecordPlayProbe;
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internal static class WavWriter
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{
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public static void Write(string path, ReadOnlySpan<short> samples, int sampleRate)
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{
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const short channels = 1;
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const short bitsPerSample = 16;
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const short pcmFormat = 1;
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int byteRate = sampleRate * channels * bitsPerSample / 8;
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short blockAlign = (short)(channels * bitsPerSample / 8);
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int dataBytes = samples.Length * sizeof(short);
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int riffChunkSize = 36 + dataBytes;
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using var fs = new FileStream(path, FileMode.Create, FileAccess.Write);
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using var bw = new BinaryWriter(fs);
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// RIFF header
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bw.Write(new[] { (byte)'R', (byte)'I', (byte)'F', (byte)'F' });
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bw.Write(riffChunkSize);
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bw.Write(new[] { (byte)'W', (byte)'A', (byte)'V', (byte)'E' });
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// fmt chunk
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bw.Write(new[] { (byte)'f', (byte)'m', (byte)'t', (byte)' ' });
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bw.Write(16); // fmt chunk size for PCM
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bw.Write(pcmFormat);
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bw.Write(channels);
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bw.Write(sampleRate);
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bw.Write(byteRate);
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bw.Write(blockAlign);
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bw.Write(bitsPerSample);
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// data chunk
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bw.Write(new[] { (byte)'d', (byte)'a', (byte)'t', (byte)'a' });
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bw.Write(dataBytes);
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foreach (short s in samples)
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bw.Write(s);
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}
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}
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